Mast.



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trm rnn snares Pannier canton.

ANDREW GRAY, OF LONDON, ENGLAND, ASSIGNQR TO MARCONI WIRELESS TELEGRAPH @UMPANY OF AMERICA, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

MAST.

Specification of Letters Patent.

Patented Feb. 2%, timid.

Application filed December 22, 1911. Serial No. 667,271.

To all whom it may concern:

Be it known that I, ANDREW GRAY, a subject of the Kin of Great Britain, residing at Watergate ouse, York Buildings, Adelphi, London, England,-have invented new and useful Improvements in Masts, of which 7 i the following is a specification.

This invention relates to masts such as those used for supporting the antennae or aerial conductors used in wireless telegraphy An embodiment of this invention and the method of erecting the mast are illustrated in the accompanying drawings.

Figure 1 is a general view of the mast; Fig. 2 shows a portion of the mast to a larger scale; Fig. 3 is a-transverse section on the line 3-3, Fig. 2, and Fig. 4 illustrates the method of erecting the mast.

The mast is built up of sections each of which consists of a pair of half cylinders a secured together by bolts (1 passed through longitudinal flanges a, the flanges of one section being arranged at right angles to those of the section below it. One section is secured to that beneath it by bolts 6 pass-v ing through end flanges 6. Between these end flanges is secured a disk 0 made in two halves with a square hole 0- in it. d is a pole which passes down through the holes 'in the disks 0 at the top of the mast and is supported by a pin 6 which passes through a hole in the pole and rests on the disk.

The method of erection is as follows: The pole is set up on end centrally on "the mast foundation and so many of the sections as can conveniently be handled from the ground are secured in position above'the pole. f is a cage surrounding the mast and suspended by ropes i from pulley blocks f hung from arms d at thetop of the pole. A rope g passes from a bracket 9, which can be detachably secured to the top of the highest section a, beneath a pulley d at the bottom of the pole, over a pulley g which can likewise be secured at the top of the highest section and down to the ground where it is made fast to a winch 9 Two or more men enter the cage and lower a: so that all these pieces may be alike and.

that by arranging them right end up all the holes may lie in the same vertical plane through the axis of the mast. The men remove the in through the holes 6 the mast and cage eing meanwhile supported only by the rope g. This rope is then hauled in, raising pole and cage together until the hole in the pole is clear above the top section when the men place the pin through the hole in the pole and the pole is then lowered until the pin rests on the top disk. The rope g is then slacked and the men dismount the bracket g and pulley 9 leaving the rope still beneath the pulley d2, Two new pieces a and two half disks 0 with the necessary bolts, &c., are then passed up to the cage inders, a pair of half disks interposed between the adjacent ends of each pair of sections and provided at the center with an opening, a pole located within said sections and openings, means adjustably supported by the pole for facilitating the erection of the mast, means including devices adapted to be "detachably connected to the uppermost section forelevatin said pole and means cooperating with sald half disks and independent of said elevating means for retaining the pole in elevated position.

' ANDREW GRAY.

Witnesses: Airmen CARPENAEL," Junn,

H. O. JAMJESON. 

